Yep... He has always been rather unconventional and he has said some things that could be regarded as controversial, but for him to attack SEALs like that doesn’t add up. Something has definitely happened to his mental state in recent years.
Maybe too many concussions? I knew a martial arts instructor who used to break those concrete blocks with his head, and he developed ALS. The theory was that the multiple concussions had some sort of causal relationship with the deterioration.